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Questions tagged [traffic-filtering]

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Change UDP traffic on the fly. Searching for Network device

I have one specific hardware which generates UDP traffic but due to one single issue inside the UDP data part, another device can't correctly work and skip UDP packets. Please, can you suggest to me ...
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18 views

why is linux traffic control `tc` tool's latency parameter not working?

I need to measure a client/server application's behavior in a LAN and a WAN setting. To this end, I decided to use Linux Traffic Control tc tool box and configured it like this: LAN sudo tc qdisc add ...
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  • 101
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24 views

How do I filter inbound/outbound traffic based on words?

I need to filter some outbound requests to certain sites based on the request headers and post data. I might be interested in filtering inbound packets as well. They are in plain text (ie not https). ...
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  • 826
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1 answer
274 views

Removing stubborn Cisco Content Filter on macOS

I've had a lot of problems with Cisco AnyConnect Socket Filter causing DNS lookups and other stuff to fail. Sometimes I've even had to reboot the Mac in order for my networking to start again. My ...
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1 answer
80 views

TCPView (Windows) doesn't show any addresses

I'm using TCPView 4.16 for Windows 10 (downloaded from https://docs.microsoft.com/en-us/sysinternals/downloads/tcpview). Up until a few days ago it worked fine, but all of a sudden it simply stopped ...
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Router has no traffic-filter command. eNSP

There was a problem. I built this diagram, indicated IP to each interface. Topology Created an access list. Added a rule to it. I went to the Ethernet 0/0/0 interface and tried to enter the traffic-...
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35 views

Regex char class - more elegant solution

I have two barracuda FWs with different log structure and a Logstash grok filter plugin that needs to parse them. values only log entry +02:00 Info blabla Detect: FWD|TCP|bond0.777|1.1.1.1|53329|...
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1 vote
1 answer
58 views

Packet filtering with the u32 selector does not work

I'm trying to figure out whether the QoS solution I integrated into my RaspberryPI works or not. I found out that port-based traffic classification doesn't work, so I tried to check the filters used ...
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0 votes
1 answer
399 views

How Do I Redirect HTTP(S) Requests From a Specific Domain to a Localhost Server?

I currently have a program that requests data from a server (let's say google.com), and gets replies from that same server. This application works on many devices like Android, iOS and Windows. ...
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15 views

Filtering out JavaScript while communicating with the server

the community! I am trying to achieve to filter out (or disable) all JavaScript data from the HTML page before delivering it to the browser. Disabling it in the browser doesn't suit me and I need to ...
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  • 101
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0 answers
3k views

Can Windows 10 firewall be configured to interactively ask permission for outgoing traffic?

I'm rather unfamiliar with the default firewall in Windows 10 Professional. I find many articles on how to configure or finetune it to filter specific traffic (ingoing or outgoing). However what I ...
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175 views

ISP Blocking SNI Extension (Server Name Identifier) In Windows 10 But Not Server 2016

Out of curiosity I noticed my ISP (talktalk - UK) was able to block certain websites by the SNI Extention, however only from Windows 10. When attempting to access the same website from Server 2016, it ...
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57 views

Internet goes down when I connect the UDP Streaming into the Switch

Team, When I connect the PC-1 ( within the same LAN) I have internet Drop issue. The IP address of the PC-1 is IP (192.168.86.119) Subnet Mask (255.255.255.0) Multicast UDP (238.1.1.1) ...
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50 views

Block fake users & fake ip addresses from using application

I am facing some issues when it comes to application's traffic & its users. The point is that users tend to sign-up/register on my SaaS application. They use(mostly for wrong purposes) the product ...
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1 answer
48 views

I can not write normal filter in wireshark filter input

Why I can not write normal filter in wireshark filter input? you see I write the filter: ip.src==192.168.2.228 there seems do not work.
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118 views

How can a port be filtered from one machine and open from an adjacent machine?

On my home network, I am trying to connect all the devices to the new SMTP (port 25) relay at my new ISP. I can connect to the port from 2 separate machines (laptop via wireless lan, raspberry pi via ...
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  • 101
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0 answers
37 views

How can I prioritize packets coming different source one over another?

I am trying to prioritize a stream of packets over other packets coming into the router. I am running twitch and some other background process (iperf, other youtube live etc.) and I want to prioritize ...
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0 answers
38 views

Unblock Google Analytics on all company computers except a few users

We are currently blocking GA in our company using IP filtering. We all share the same IP so exclude this in GA. However, we have an internal sales team that take sales on the phone. We'd like GA to ...
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1 vote
2 answers
363 views

How can I monitor all activity from only one software with Wireshark?

I would like to know if it is possible in WireShark to monitor ONLY the activity coming from a single software. p.e. if I use CSVpad.exe, how can I monitor all activity from CSVpad?
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  • 201
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1 answer
56 views

Ways to filter http traffic programmatically

How many ways are there to programmatically filter http trafic over device? Not only to capture packets and ban by regex as wireshark but to build a filter that for example requests a page, extracts ...
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6 votes
1 answer
23k views

Configure DD-WRT to Limit Bandwidth on Devices

I have flashed DD-WRT firmware to my TP-Link WRT841-N router, set the basic network configuration & wireless. I want to limit bandwidth on a user who is always using torrents which is causing my ...
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0 votes
1 answer
601 views

What are methods of blocking or redirecting websites in Windows?

What are ways besides the hosts file, that I can redirect or otherwise block websites entirely through the use of software? Malwarebytes Premium is able to redirect websites it detects are bad and ...
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0 votes
1 answer
896 views

Qubes Firewall Not Working-Blocking Anything

On Qubes R3.2 I am running an AppVM made off fedora-23 template with the NetVM as the sys.firewall. In the firewall rules I have Deny Network Access except...and have nothing checked and nothing in ...
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0 votes
1 answer
85 views

Why do we even use ad blockers at home when most home routers have filter lists?

I started pretty much like the rest of us with regular ad blocking extensions. But there is arguably a performance drop due to the additional checks each time you load a page. I then started using ...
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  • 468
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1 answer
527 views

How to I configure iptables for both IP masquerading and firewalling at the same time?

I have a host that acts as a gateway for routing a home network to Internet. IP Masquerading has been enabled for months now and the system has worked fine. How do I configure it to function also as ...
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0 votes
1 answer
120 views

How do we stop or reduce P2P use of the guest Wifi?

I support a small business' tech issues. Their guest Wi-Fi is important since they want people sitting around and consuming their product. We’re currently using a consumer-grade access point with DD-...
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1 vote
0 answers
100 views

dir-300 router is able to block any website, but not Facebook [duplicate]

I'm trying to block the access to certain websites using the Website Filter section from Dlink DIR-300 Admin (Firmware 2.14, Hardware Bx which is the latest). It works for any keyword, except for ...
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0 votes
2 answers
431 views

DD-WRT AP with ethernet bridge

Good evening everyone! I'm looking to host a wifi access point using my DD-WRT (Linksys WRT54G) with a PC running Kali Linux 1.1.0 (Debian) to monitor the traffic. Effectively the traffic would flow ...
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1 vote
1 answer
83 views

MAC filtering for Network

I have TP link router and I want to block unwanted users on my network so I used MAC filtering but it has limitation that I can add only 64 users in it to allow on my network but I want to add more ...
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3 votes
3 answers
6k views

Alternative to 127.0.0.1 in hosts file

I have a bunch of websites blocked at the system level in my Windows 7 by using the etc/hosts file. So far, I've done it the usual way, by giving 127.0.0.1 as the website's IP address. However, I'd ...
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2 votes
0 answers
1k views

How to find out where my https traffic is being blocked

I have a network of machines around the country, connecting via https to a cloud-based server through cellular modems. Only one machine has a problem connecting. When I run nmap -p 443 <server_ip&...
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  • 439
1 vote
1 answer
148 views

Filter squid cached files to multiple cache dirs

I am currently setting up a small home network - I've chosen to go with squid proxy and I am wondering if it is possible to setup a single squid instance with multiple cache_dirs so that different ...
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1 answer
63 views

How can I filter my home network?

I live in an apartment with one roomate. They have a monopoly, as the complex actually has it's own special ISP they offer...and they restrict other, better providers like Verizon, Charter, and so on. ...
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1 answer
1k views

TC command via webpage as a sudo

The main goal- run a tc command via webpage, starting with: tc qdisc del root dev eth0 (deletes all the filters) Following Simple linux commands from a webpage I am trying to add a tc command, but ...
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7 votes
1 answer
55k views

pfSense to route between multiple subnets on same LAN

I started with a fairly standard pfSense setup: one WAN and one LAN interface, LAN-to-WAN access via NAT. Now I needed a second logical subnet on the LAN, which I set up in the following way: ...
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1 vote
1 answer
204 views

how to survey and show every single connection from Firefox?

I want to find which files or data is downloaded while loading and interacting on a specific webpage. How do I show every connection attempt from Firefox? I would like to use command line tools (...
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1 vote
2 answers
406 views

Bandwidth monitoring grouped by domain/process

Under Windows platform, what is the simplest way to achieve bandwidth monitoring with the following grouping use cases: monitor all incoming/outgoing bandwidth grouped by domain/ip (http requests ...
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  • 265
1 vote
1 answer
868 views

Privoxy: Disable "deanimate-gifs" filter

I'm using privoxy on a debian server and want to disable the privoxy filter deanimate-gifs. I found these instructions to disable it via the web-based toggle feature: Point web browser to http://...
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  • 327
0 votes
1 answer
2k views

Stop Facebook at router?

I would like to limit when we can access Facebook from all our computers/devices. My thought is to put a filter on our router (ASUS N66U w/ stock firmware). I have tried to add a Network Services ...
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  • 163
2 votes
2 answers
1k views

Drop IP fragments of a certain protocol

When conntrack is active, the iptables stack never sees a fragmented IP packet, only the reassembled one (source), so the -f test never matches. If I want to block any fragment I could set ...
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3 votes
1 answer
3k views

Route between two network interfaces with same IP address?

I would like to temporarily monitor/log/analyze what traffic is going in and out of my home. I would also like to keep my current router configuration unchanged. The router is a WiFi Home Router, so I ...
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1 vote
2 answers
27k views

What is well-known port number of P2P applications?

I have some trace files (truncated tcpdump file) contains traffic of a network. I want to separate packets of P2P applications such as BitTorrent,Skype,etc. Does any one have a list of well-known ...
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1 vote
1 answer
1k views

How to blacklist porn? [duplicate]

Is there a way to blacklist sites containing specific keywords? like for example "porn, xxx.. sex". My cheap router can only block 5 specific domains but not sites containing some keywords. Do you ...
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  • 255
2 votes
1 answer
670 views

How can I filter incoming packets to my application?

I have only little experience with Wireshark. The problem is that when my server (3rd party app) receives a faulty packets, it crashes. I would need to filter the incoming packets and filter out such ...
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1 vote
1 answer
2k views

Is there any Base Filtering Engine (BFE) service in Linux similar to windows

In windows we have Base Filtering Engine which helps applications to monitor network traffic. Is there any similar service which runs in Linux too. Something similar to a packet filtering service. I ...
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0 votes
2 answers
1k views

TCP packets not captured by PHP listener

I have a device (GPS localizer) that is sending TCP (I think so) packets to my server on given IP address and through given port. Since I have only SSH access to that server, I opened up two sessions ...
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1 vote
1 answer
1k views

How to selectively filter or block non-http/s traffic?

I know that it is possible to filter web content, say, with Squid+ICAP Server. But, is it conceptually as well as practically possible to monitor, filter, and programatically transform arbitrary (...
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  • 739
0 votes
2 answers
97 views

Providing Wireless for a Crowd

I want to provide limited internet access for a crowd of people (~50) who will be attending a 1-hour talk of mine, at a conference where wireless is not provided. But I want to give them access to a ...
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  • 103
5 votes
1 answer
91k views

What port does Netflix device streaming use?

What port does Netflix device streaming use? Is this port also used by the website direct streaming in the Silverlight app? What is the HTTP Content-Type if it uses port 80? Thanks.
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  • 382
0 votes
1 answer
427 views

Firewall traffic filtering that blocks some necessary services

I study at a college where they use Cyberrom for Internet traffic filtering. I use Open Vpn to connect to my server run by a Webhosting company. The VPN server listens on a 40000+ port. I can connect ...
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  • 461